rate.
Confirmed by Alina to be a drop rate of more than 20%.
Still available for owners of Legion SoulSeeker Pet.
Also see:
Bright SoulSeeker (AC).
Bright SoulSeeker (Legend).
Legion SoulSeeker Pet.
Obsidian SoulSeeker.
SoulSeeker Battle Pet.
Thanks to Dannyg64 and Warlord126.